Malicious PDF — malware analysis report

Static analysis result for SHA-256 e523975609fe9019…

MALICIOUS

PDF

88.7 KB Created: 2021-07-16 17:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdd9f8ff403a804ae5150ee7fe026e86 SHA-1: 1f630b500dafadf2926bd4245ea0c0dc26d61054 SHA-256: e523975609fe9019fad9325ae765671ac0e15be8a6ac6569e948fe56eb7d41ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://coimbra.hu/uploads/ckfinder/userfiles/files/4135434579.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ac07f49bad356e4c91cd81b98324e090/44481757181.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a661ab3c591---falijazesekeveladeviwiluv.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/81335678731.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f06148b5b6e3975b9a1ef10e2b0545f6/bukifutopisevafuxovuwezu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c223052bdf---22289173542.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5f7550df5538d5cccf5633e7c96e48fa/56071938598.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/65884812049.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/73983581854.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/35201052375.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/81787623929.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jijofejuturereg.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/gabin.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0048c660---1404681859.pdfIn PDF document text
    • http://186086.com/upload/files/6034711976.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/botegevotusap.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27450814757.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6puak3h7bhtkhe6hqnne3agon0/38780159529.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67124242852.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1e2e55ec---deritofiwitobusunex.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51486633877.pdfIn PDF document text
    • https://kildevangen.dk/files/63169274288.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/12594782647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=one+flew+over+the+cuckoo%27s+nest+awardsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 17036 bytes
SHA-256: 5d346e38b851caacdbf37c968edabb86c0f09113b082ffd8cb9ac8f2ac600216
font_01_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 10884 bytes
SHA-256: 662fd26dd6b70691ad15fc121d2fd364cbeae3a16754ec6293ef3224f8b839fc

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